Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c08ad045566d55f…

MALICIOUS

PDF

80.4 KB Created: 2021-09-05 04:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a84ec7125dfa9624f20fc6f0f208db37 SHA-1: 27ade710d0183c1d892df2c9beee47a4f0e00382 SHA-256: 6c08ad045566d55ff2a22379d51ec4cd77e9a2da13d86f7dc5cb41156027a631
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution attempt. The 'SE_INVOICE_LURE' heuristic indicates the document's content is designed to trick the user into clicking these links. While no scripts were directly extracted, the presence of multiple external links and the ML classification strongly suggest malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cructi.ru/uplcv?utm_term=audit+assertions+and+procedures+pdf PDF link annotation
    • http://tipiland.net/upload/file/833803461.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/g1splu6ic4tjeg89trtd3tma92/fiduni.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8fb98bf8a---45557197154.pdfIn PDF document text
    • http://rilta.net/userfiles/files/nikevenonugav.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1612cfcfb6a941---gunezamarijiwofawokujobos.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/jonefep.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/zibegekibuxezezebexo.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/9ffadc235c957a521b6faa6feec54613/xetomekonogibusufox.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608624e47845b---dabamipopirojimo.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/molesilexesetolepazu.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/de3a1a90997bb0d9cb11525735e0dccf/zebafemamamizoxegaborujo.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/128j5a1hj1db7ef4qq8ifj1cj6/38647071679.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b13c1acdb2---nolawumekiwibopovu.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/46940272158.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/b10e1f9b6dce0005467348ae91e04c44/robutuzojom.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/753a8f35a9d54b24673419026dede8ad/nesesikapizonotanuxumu.pdfIn PDF document text
    • http://vasamo.org/pds/userfiles/files/lezevolodogedefi.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/20821761970.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/tafudomuvopoxi.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/taveg.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/durekaxefilugilo.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/f1253aa5af9060130b21b988e4c69f7d/gisolasapibadobidumolad.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/raguvexa.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/76576804107.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADF 10648 bytes
SHA-256: f682c402e0ef3dc4f88a9bef4abd62d049b0ef6ac06a9e76372c6adfd21ae3f9
font_01_sfnt_off0000f36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7D 15720 bytes
SHA-256: 5bc4bb4a6d78b3466d441886691923e0dbe934bc63f07149b3595b2889ed65c5

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